This ultimate tactical air rifle features Nitro Piston technology and a lightweight synthetic stock with pistol grip for control and maneuverability. The S in NPS indicates a short barrel. With a barrel 2 shorter than the TR77 NP (model #30131), the TR77 NPS offers outstanding maneuverability when close quarters demands it. Features a two-stage adjustable trigger and CenterPoint 4x32 mm scope with dovetail mounts.